Build reduced physical fields from temporal spectra probes data

We should be able to use data recorded by "probes" in base/output/temporal_spectra.py in order to re-build decimated/truncated physical fields, similarly to what is used in the post-processing of experiments in the coriolis platform.

In order to do this, we need to:

• load data from all probes at a given time.
• rearrange data into an array the shape of truncated/decimated physical fields.
• write the newly built arrays into files that are compatible with the post-processing methods used in experiments.